Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca7e0b36c48c7f5…

MALICIOUS

PDF

70.9 KB Created: 2021-02-07 22:00:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: c9767d14fd67c4601552f5e20b0e760f SHA-1: ca36b58050caf802cf7a33ff9bc57cc410611a00 SHA-256: aca7e0b36c48c7f534591139efc03885521a60f389926b11f5b20a080dc6a799
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs, many pointing to disposable hosting services, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the PDF structure strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crophysi.ru/123?utm_term=kohl+elementary+bell+schedule PDF link annotation
    • https://cdn.sqhk.co/gifexajed/g6vt2je/99123191677.pdfIn PDF document text
    • https://gikejujeg.weebly.com/uploads/1/3/5/9/135966421/4508726.pdfIn PDF document text
    • https://cdn.sqhk.co/natefisaka/fjdWjjP/72493568150.pdfIn PDF document text
    • https://vizosajigu.weebly.com/uploads/1/3/1/3/131381839/f8f69a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373239/normal_5fe10ba895e79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450438/normal_5fd9ac09276dd.pdfIn PDF document text
    • https://sodikisug.weebly.com/uploads/1/3/1/4/131437766/5cb863c05c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495686/normal_5fe832ae2e864.pdfIn PDF document text
    • https://sifirugosiwoxam.weebly.com/uploads/1/3/1/3/131384024/xupamewe_ragofup.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuwutitaw/eJhgZyp/the_wolf_of_snow_hollow_full_cast.pdfIn PDF document text
    • https://cdn.sqhk.co/pubamegumox/jihhiiL/terranova_pizza_dough_instructions.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390051/normal_5ff51ee264a2f.pdfIn PDF document text
    • https://baraxuworasexe.weebly.com/uploads/1/3/4/6/134633060/0240168.pdfIn PDF document text
    • https://cdn.sqhk.co/sesexibanobu/tgfieFU/buxuvagodis.pdfIn PDF document text
    • https://jomaredavox.weebly.com/uploads/1/3/2/3/132302995/rafujilivu.pdfIn PDF document text
    • https://cdn.sqhk.co/mitajaso/hb0O9Af/carx_drift_racing_online_xbox_one_key.pdfIn PDF document text
    • https://cdn.sqhk.co/gojapawareke/iiiKgtd/mod_among_us_map_npc_2020.pdfIn PDF document text
    • https://mivagadak.weebly.com/uploads/1/3/4/5/134599435/lexazukutaduri.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A2 5392 bytes
SHA-256: 58807bc2d258a3934718f0f632e9daf411994e1c9afc17207233f180954dba9a
font_01_sfnt_off0000ebcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCD 10244 bytes
SHA-256: d73aa1c36a5ca14448f8b6fa1b6bd48f5606e26b00042aed324f12e16c41abce

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